This has now become my favourite D M Potter interactive story. It's educational - great information on caves, butterflies and sailing for example, excellent way to learn new vocabulary - my slugs were stumped on a few occasions, and most of all, it's challenging and fun. On my adventure, I went to the beach then found a cave, went up to the fortress and sailed over to an island where, something quite odd happened. I shan't say more! The pacing is excellent and the tension just builds and builds. Definitely one to buy!